Alexander beckers



A. BECK ERS.

( Stereos cope. No. 26.407. f Patented Dec. 13,1859.

7722'n6 1 a, Ma M 64 UNITED STATES ALEXANDER BECKERS, OF NEW YORK, N. Y.

DOUBLE EYEPIECE FOR Specification of Letters Patent No. 26,407, datedDecember 13, 1859.

To all whom it may concern:

Be it known that I, -ALEXANDER BECKERS, of the city, county, and Stateof New York, have invented a new and useful Improvement in DoubleSight-Tubes, Eye-Tubes, or Eyepieces for Stereoscopic and other OpticalInstruments; and I do hereby declare the following to be a full andexact description of the same, reference being bad to the annexeddrawings, making part of this specification, in which I Figure 1, is alongitudinal section. Fig. 2, a perspective View of my improvement.

The same letters of reference mark the same parts in these figures.

In order to protect the eyes against being affected by rays of light onthe sides various devices are adopted. In spectacles movable side platesare sometimes used. In stereoscopic instruments movable separate sideshields or shades are adopted which are connected with eye tubes of theusual form in such a manner as to form the higher portion on the outsidewhen the said shades are elevated.

My invention consists in connecting stereoscopic or other opticalinstruments with double eye tubes sight tubes or eye pieces,

each of which being turned of one piece in the shape of an obliquelyintersected hollow cylinder in such a manner that the outside should bethe highest and fit the surrounding parts of the eye.

T 0 enable others skilled in the art to make and use my invention I willproceed to describe its construction and operation.

A represents the outside plate of the stereoscopic or other instrumentto which the sight tubes, eye tubes or eye pieces are attached.

B and C represent the two sight tubes, the axis of each of which isperpendicular to the plate A.

O, 0 represent the respective eyeglasses of PATENT OFFICE.

OPTICAL INSTRUMENTS.

the sight tubes, the same being as usual para 5 allel to the plate A. fy

The mantle of each tube or cylinder is higher on d toward the outside ofboth tubes than on a where the tubes stand nearest. Each tube is turnedof one piece and repre sents a hollow cylinder the lower part of whichis cut perpendicular to its axis, and the upper part of which isintersected obliquely to its axis. The ellipses resulting from theoblique section are turned with a 55 beaded mold s, in order. to preventthe face from being hurt when the said ellipses are pressed toward thesame. The angle ofthe said oblique section is about 25 degrees and 1 thetubes are so arranged on the plate A that their lowest partsm and itshould be near together. The lower parts of the tubes may be ornamentedby moldings as repre= 1 sented in the drawing or in any other suit ablemanner. The advantage of this conp struction consists in having theshield or shade and the tube united in one piece. The tubes B and G areso arranged on the plate A, that each maybe turned in its respectiveopeningof the plate, thus they may] be turned so as to fit to everyface, by placing their lowest parts a, win greater or lesser proximity.

\Vhat I claim asnewa by Letters Patent is Connecting stereoscopic orother optical instruments with double eye tubes sight tubes or eyepieces each of which being shaped or turned of one piece in the form 1of an obliquely intersected and molded hollow cylinder substantially inthe manner andfor the purpose as described. 1 i

Dated New YorkNo-vember 11, 1859.

ALEX. BECKERS.

nd desire to secure WVitnesses: p

CHARLES MEHLE,

J ULIUs MEELE,

